Sewing-machine.



L. E. TOPHAM.

SEWING MACHINE.

APPLICATION FILED MAY :0, I915.

1,170 024. Patented Feb. 1, I916.

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L. E TOPHAM.

SEWING MACHINE.

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Patented Feb. 1, 1916.

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L. E. TOPHAM.

SEWING MACHINE.

APPLICATION HLED MAY I0, 19l5. 1,170,024. Patented Feb. 1, 1916.

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SEWING MACHINE.

APPUCATION HLED MAY i0, I915, 1,170,024.

Patented Feb. 1, 1916.

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SEWING MACHINE.

APPLICATION FILED In 10, 19:5.

1,170,024. Patented Feb. 1, 1916.

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SEWlNG MACHINE.

APPLICATION FILED MAY 10. 1915.

1,170,024. Patented Feb. 1, 1916.

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SEWING MACHINE.

APPLICATION FILED MAY 10, 1915 Patented Feb. 1, 1916.

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SHOE MACHINERY COMPANY, OF PATERSON, JERSEY, A CORPORATION OF NEWJERSEY.

1,170,024. Original application filed April 15, 1911,

To all whom it may concern:

Be it known that.

Specification of Letters Patent.

I, LAURENCE E. Tor- HAM, a citizen of the United States, residing.

in the county of Essex and have invented certain new and usefulImprovements in Sewing-Machines; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

The present invention relates to sewing machines and more particularlyto wax thread lock stitch sewing machines.

,iThe objects of the invention are to imfi ove the construction andoperation of oer tjix'in of the thread handling or controlling devicesof machines of the class referred to and with these objects in view, theinvention consists in the constructions, combinations aind arrangementof parts hereinafter described and claimed, the. advantages of atSwampscott,

- which will be obvious to those skilled in the companying art from thefollowing description.

The present application is a division of application Serial 15, 1911,which fully illustrates and (:2- scribes a wax thread lock stitch sewingchine employing a' straight awl and a straight hook needle; In thedrawings acmuch of this sewing machine is illustrated as is necessary toenable the construction and mode of operation of certain of the threadhandling or controlling devices to be uiiderstood. Referring to thedrawings, Figure 1 is a view in front elevation of the machine; Fig. 2:isa view in front elevation of the head of the machine; Fig. 3 is avertical sectional No. 621,286, filed April sswx ne-macnma;

Patented Feb 1, 1916-.

Serial No. 621,286. .Dfvided and this application filed Kay 10, 1915.Serial No. 27,079.

lower end of apresser bar 3. During the greater part of the cycle ofoperation of the machine the presser-foot is held againstthe work by thepressure of a comparatively heavy spring, so that the work is tightlyclamped between the presser-foot and work support. During the feedingmovement of the work, however, the presser-foot is raised from the workso as to offer no resistance to the feeding movement. Atthe end of thefeedmg movement the presser-foot is released and is again pressedagainst the work by said spring so that it has an opportunity toacccmmodate itself to the thickness of the stock. The presser-footremains pressed against the work until the beginning of the next thepresent application only so view looking toward the rear, illustratingparticularly the mechanism for actuatin the take-up; Fig. 4 is avertical sectiona view looking toward the rear, illustratingparticularly portions of the thread clamp actuating and presser footmechanisms; Fig. 5 is a view in rear elevation partly in section of thehead of the machine; Fig. 6 is a vertical longitudinal sectional view ofthe front portion of the head of the machine; Fig. 7 is a detailsectional 'plan view of the front portion of the head of the machine;

feeding movement, when it is again lifted and the cycle of operationsrepeated.

To enable the presser-foot to be actuated as above described, thepresser bar '3 is slidably mounted in brackets 4 and 5 on tli'emachineframe. The presser bar is kept from turning in its sliding bearings byairjirrn 6' extending radially from it near its upper end, the outer endof which arm isbifurcated to slidably engage a pin 7 projecting upwardlyfrom the bracket 4. The lower end of the pin 7 is somewhat reduced toform a stud which is eccentric to the axis of the pin, and whichissecur'ed ina recess 'in thebracket 4 and clamped therein by a binder8. The eccentric stud allows the pin 7 to be turned to compensatefor'wear between the pin and the bifurcated arm 6. I

The means for. automatically raising the presser-foot during each cycleof the stitch forming operations, includes a collar 9 slidabiy mountedupon the presserbar above the bracket 5. The collar 9 is provided with aforwardly extending ear or lug 10 which is bis loo

bored to slide upon a pin 11 extending up wardly from the bracket 5. Ahelical compression spring 12 surrounding the pin 11 between theenlarged head of said pin and the lug 10 tends to normally press thesleeve 9 down in contact with the bracket 5 which thus acts as anabutment for the sleeve. The sleeve 9 is also provided with two lugs 13which extend to the left, and between which is pivoted a lifting arm 14.When the free end of the arm 14 is raised, the arm 14 is first turnedfreely with relation to the sleeve 9 which is held down by the spring12, until a cam which is formed on the inner end of said arm, is turnedinto gripping engagement with the presser bar 3 locking it in the sleeve9, after which the presser bar 3 and sleeve 9 are lifted together duringthe continuation of the upward movement of the arm 14. The arm 14 isoscillated by an adjustable link 16 which connects the free end of thearm 14 with the end of an arm 17 which extends radially from the forwardend of a rock shaft 18. The a'd'ustable link 16 is formed in two parts,t e upper part fbrming a threaded socket for the reception of ascrew-threaded pin 19 which forms the lower part of the link. The lowerend of the screw-threaded piece 19 is bifurcated and is secured to theouter end of the arm 17 by a removable pin 20 which isheld in place by awire spring 21 which engages a slot in the side of the projecting endofthe pin 20. Adjustment of the link 16 is had by removing the pin 20,moving the link out engagement with the arm 17, and adjusting thescrewand socket connection, The rock shaft 18 is journaled in the machineframe and is given an oscillatory motion by means of an arm 22 extendingradially from the rear end of the rock shaft, which arm carries a roller23 running in a cam path cut in the front face of a cam wheel 24 mountedupon the continuously rotating shaft 25; The shaft 25 is journaled inthe machine frame and is driven from the vertical shaft 26 by means of agear wheel 27 meshing with a spiral gear 28 on the shaft 26. Thevertical shaft 26 is in turn driven from the main driving shaft 29 bymeans of bevel gears 30. The normal direction of rotation of thesedriving shafts is indicated by arrows in various figures of the drawincam path which oscil ates the rock shaft 18 is such that the rock shaft18 is oscillated to lift the arm 14 to raise the presser foot justbefore the -feeding movement of the work takes place, and to lower thearm 14 to release the presser foot after the completion of the workfeeding movement.

When the arm 14 is in its lowered position, the sleeve 9 is pressed aainstthe bracket 5 and the presser bar is e to adjust itself inaccordance with the varying The timing of the r thickness of the work,so that, when the arm 14 is afterward raised, it .will grip the resserbar in whatever position the presser bar may be and lift the presserfoot a predetermined distance from the surface, of the work, regardlessof the thickness of the work. A fixed amount of motion is communicatedto the lifting arm 14, but the amount of lifting movement imparted tothe presser bar 3 ma be varied by adjusting the inclination 0 the arm 14by means of the adjustable link 16. By shortening the link 21, theamount of free movement of the lifting arm 14 before its cam-shaped end15 grips the presser bar will be increased, and the amount of liftimparted to the presser foot will be correspondingly decreased, sinceonly the lifting movement of the arm 14 after the cam has gripped thepresser bar is effective to raise the presser bar.

To enable the presser foot to be raised by the operator with the partsof the machine in any position which they assume during a cycle ofoperations, and particularly when the parts are in a position to permitthe removal or insertion of work, a treadle is provided and suitableconnections whereby the presser foot may be raised at the will of theoperator. To enable the presser foot to be thus raised the upper end ofthe presser bar is offset rearwardly to form an upwardly extending plate31 which is provided with a horizontal forwardly extending ledge orshoulder 32. This shoulder 32 engages over the top of a round finger 33which extends rearwardly from the extreme end of a lifting arm 34 andwhich also bears against the flattened top of the main portion of thepresser bar. The shoulder 32 and the flat upper surface of the mainportion of the presser bar thus form between them a laterally extendingslot for the reception of the finger 33, so that when the arm 34 islifted it will raise the presser bar. The arm 34 is formed on a sleeve35 which is rotatably mounted upon a pin 36 which forms the forwardbearing of a rock shaft 37. The rear end of the sleeve 35 has formed init notches or recesses 38 in which are engaged forwardly projecting lugs39 on the rock shaft 37. The lugs 39 are sufliciently smaller than thenotches 38 to allow the sleeve 35 enough lost motion with relation tothe rock shaft 37 so that the lever arm 34 is free to turn idly aboutits bearing on the pin 36 when the presser bar is raised and lowered bythe automatically operated liftin arm 14 during the normal operation 0the machine.

The rock shaft 37 is turned to raise the arm 34 and presser bar 3 bymeans of a sliding bar or rod 40 secured to the laterally projecting arm41 of a bell crank lever 42 rigidly mounted upon the rear end of therock shaft. The sliding bar 40 is drawn downwardly by a wire 43 runningto a suitable treadle, not shown. .In order to raise the treadle afterit is released by the foot of tlie'joperator, a helical compressionspring is coiled about the rod 40 between the enlarged-upper end of saidrod and a plate which is secured to the machine frame, and through whichthe bar 40 is slidably received. When the operator depresses the timewhen the needle and awl are out of the work and permit its easy removalthe lifting arm 14 is in its downwardly turned position and out'of itsgripping engagement with the resser bar so that the presser bar is freeto slide up and down through the sleeve 9 whichis held down against thebracket 5 by the spring 12. The presser bar may, however, be raised bythe treadle when the machine is at any position in its cycle ofoperation. If the treadle is depressed to raise the resser bar when itis gripped in the sleeve 9 by the lifting arm 14, the presser bar 3 andsleeve 9 will be lifted together until the arm 14, whose outer end isheld by the link 16, is turned sufficiently to disengage its cam shapedend 15 from the bar, after whlch the sleeve 9 will be no longer raised,

- but the presser bar will be freely lifted a toothed connection 48.

through said sleeve. The downward pressure which normally holds thepresser foot against the work is supplied by a comparatively heavyhelical'spring 46 wound over the rock shaft 37, the forward end of whichspring is extended laterally and bears down upon the finger 33 of thearm 34, and the rear end of which spring is-secured to the forward endof a sleeve 47 rotatably carried upon the rock shaft 37. For convenienceof construction the sleeve 47 is formed of front and rear portions,which are secured against ihtation relatively to each other under theaction of the spring 46 by means of Gear teeth 49 are cut in the rearportion of the sleeve 47 and mesh with a worm cut on a shaft 50 which isadapted to be manually turned by means ofthe handle 51 to adjust thetension of the spring 416 against the presser bar.

The tension device comprises a thin circular plate or wheel 212 the edgeof which is formed with serrations which are alternately offset to forma peripheral thread re-vzeiving groove in which the thread is held fromslipping relatively to said Wheel. The wheel 212 is loosely mounted torotate on a bar 213 which is slidably mounted in a bracket 214projecting upwardly from the head of the machine. A suitable frictiondevice is provided for retarding the rotation of the wheel 212 so that astrain or tension may be put upon the thread as'it is drawn from-thework side of the tension device.

The friction device comprises two friction disks or brakes 215 and 216between which the wheel 212 is adapted to be clamped. The friction disk215 is secured t6 one side of the bracket 214 and the friction disk 216is slidably splined upon the bar 213. The right end of the bar 213 issomewhat reduced-to form an annular shoulder or abutment 217 which isadapted to be engaged by a corresponding shoulder formed on the interiorof the hub of the friction disk 216 and limit the movement of the disk216 to the left on the bar 213. A helical compression spring 218extending between the disk 216 and a knurled nut 219 on the end of thebar, normally presses the disk 216 against the stop shoulder 217, exceptat such times as the bar 213 is drawn to the left to apply the disk 216directly to the side of the Wheel 212. When the bar 213 is drawn to theleft, the disk 216 is brought against the side of the wheel 212, and thecontinued movement of the bar 213 withdraws the shoulder 217 from itsengagement with the disk 216 so that the wheel 212 is frictionallyclamped between the brake disks 215 and 216 to put a tension on thethread as it is drawn over the wheel 212. The degree of tension put onthe thread may be varied by adjusting the tension of the spring 218 bymeans of the nut 219. When it is desired to relieve the thread of thestrain put on it by the friction device, the bar 213 is released,whereupon the spring 218 will draw the bar 213 to the right until thestop shoulder 217 is brought into engagement with the disk 216 andrelieves the wheel 213 from the pressure of the disk 216 so that it maybe freely turned.

The means for actuating the bar 213, as above described to apply andrelease the friction device, comprises a vertical lever 220 pivotallysecured to the left end of the bar 213 and fulcruined against the pointof an adjustable pin 221 on the side of the bracket 214. The lower endof the lever 220 is formed with a ball 222 which is received in acylindrical recess 223 in the top of the sleeve 224 which is mountedupon the forward end of a rock shaft 225. The rock shaft 225 isoscillated to actuate the lever 220 through the ball-and-recessconnection and operate the friction device as above described. Thcball-and-recess connection also holds the lever 220 from movingforwardly or backwardly, and s0 maintains the bar 213 from turning inits sliding bearin in the bracket 21 1. The rock shaft 225 1s oscillatedby means of a radially extending arm 226 mounted upon its rear end. Abell crank lever 227 is pivoted at its elbow to the end of the arm 226.One' armof the bell crank lever 227 .is pivotally connected at 228 toone end of a link 229, the other end of which is pivotally connected at230 o the upwardly extending arm 231 of the bellcrank lever 42 which isadapted to be turned by the presser foot lifting treadle hereinbeforedescribed. The other arm of the bell crank lever 227 is pivotallyconnected at 232 to one end of a link 233, the other end of which ispivotally connected at 234 to an arm 235 extending from a rock shaft236. The rock shaft 236 is journaled in the machine frame and isoscillated by a downwardly ertending arm 237 which carries a cam roller238 running in a cam path cut in the rear face of the cam wheel 239.During the normal operation of the machine the connecting point 230 isstationary and the bell crank lever 22T fulcrums about the point 228 sothat the motion of the cam actuated arm 23? is transmitted through theshaft 236, the arm the link 233 and the bell crank 22? to oscillate therock shaft 22.) to apply and release the friction device of the threadtension once during each cycle of the stitch forming operations. Theoscillation of the rock shaft 225 is constant in amount and is timed bythe cam wheel 239. The timing of the application and release of thetension put upon the thread by the friction device ma be varied withincertain limits by the adjustment of the fulcrum pin 221 by which more orless lost motion is allowed between-the lever 220 and the pin 221. andthe period during which the thread is held under tension shortened orlengthened respectively. The timing of the application and release ofthe friction device, with respect to the other operations of a stitchforming cycle, will be hereinafter described with relation to the timingof the thread locks.

In addition to the above described automatic means to actuate thefriction device. a manually operable release is provided. The manuallyoperable release is actuated by depressing the treadle which raises thepresser foot and the friction on the thread tension is releasedsimultaneously with raising of the presser foot, so that the thread maybe freely drawn out under no tension when the work is removed from themachine. \Vhen the presser foot lifting treadle is depressed, the bellcrank -12 is turned to draw the link 229 downwardly and to the right.This acts to turn the bell crank 227 so that the toggle which is formedby one arm of the bell crank 227 and the link 233, is broken and the arm226 is moved downwardly to the left to turn the rock shaft 225 andrelease the friction disks from the wheel 212.

The pull-off by which during each cycle of the operations of the machineenough thread is pulled from the supply for the formation of thesucceeding stitch is indicated at 240 and consists of a finger clampedto the right hand end of a rock shaft 241 horizontally and laterallyjournaled in the so that their position, with relation to the pull-off,is changed by any variation in the thickness of the work being operatedupon. The thread passes from the tension device downwardly through theeye 251, then later-' ally across beneath the pull-off finger 241 to theeye 2 The pull-off finger engages the thread between the eyes during itsdownward stroke and it will be obvious that since the stroke of thepull-off is constant, the amount of thread pulled from the supply by thepull-off will vary with the position of the eyes and more especiallywith the position of the eye 252. During its downward movement thepull-off pulls thread from the supply through the eye 251 in thedirection in which the thread leads through the eye, this eye actingmerely as a thread guide to keep the thread at the right of thepull-off. The eye 252, therefore. forms the essential part of the threadmeasuring device since upon its position de pends primarily the amountof thread pulled off by the pull-ofi', although the eye 251 performs animportant'and useful function in leading the thread to the eye so thatit will be properly engaged with the pull-oil. \Vhen the presser foot israised, the eyes 251 and 252 are raised and a greater amount of threadwill be pulled off between them by the downward movement of the pullofi'finger.

The main take-up is indicated at 253 and consists of an arm secured tothe forward end of a rock shaft 25-1 and provided at its free end with atake-up roll 255 which cooperates with the thread guiding rolls 256 and257 to draw out a loop in the needle thread. To secure ease, smoothnessand certainty of operation, when the machine is running at high speed,the rock shaft 254 carrying the take-up arm 253, is operated throughsuitable connections from a continuously rotating crank 258 which iscarried upon the front face of the cam wheel 75. These connectionsconsist of an arm 259 upon the rear. end of the rock shaft 254, a link260 connecting said arm with an arm 261 carried by a rock shaft 262which is journaled to the machine frame,'and a link 263 connecting a.second arm 264 on the rock shaft 262 to the continuously rotating crankpin 258.

Front and rear thread locks indicated at 276 and 277 act intermittentlyduring the cycle of operations to clamp the thread between the take-upand pull-off, and between the pull-off and tension respectively. Thefront thread lock 276 closes so that the thread is clamped throughoutthe action of the pull-oil", the rear thread lock at this time beingopen so that the thread may be ulled through the tension by thepull-ofl'.

he rear thread lock 277 closes so that the thread is clamped throughoutthe action of the take-up, the front lock at this time being open sothat the stitch is set against the rear lock. The setting of the stitchagainst the rear thread lock pulls the thread taut through the threadguiding eyes of the pulloff and insures that no slack thread is left sothat the proper amount of thread will always be drawn by the pull-oilthrough the tension. The thread locks are so timed that the thread isnot released by one lock until after it is clamped by the other look, sothat the thread at no time is free between the supply and the needle,and the feed of the thread is perfectly controlled during the entireoperation of the machine. The times at which the thread is held by bothlocks occur immediately after the operation of the take-up andimmediately after the opera tion of the pull-off.

The front lock, indicated generally by 276, consists of a thread roll27S and a cooperating clamping shoe 27 9 which is ada'pted to'grip thethread against the roll. The clamping shoe 279 is formed on the lowerend of a lever 280 pivoted at 281 to the frame of the machine. Themechanism for oscillating the lever 280 to actuate the thread lockcomprises a rock shaft 282,

which carries upon its forward end an arm 283, bifurcated at its freeend to engage the lever 280 and which carries upon its rear end twolaterally extending arms 284C and 285, bearing on their free ends camrollers 286 and 287 respectively, which run against two cam surfaces 288and 289 formed side by side around the periphery of the cam wheel 75.These two cam surfaces 288 and 289 are so proportioned relatively toeach other that the rollers 286 and 287 are always adjacent theirrespective cams, so that no lost motion occurs between the rock shaftand these driving cams. The timing of the cams is such that the clampingshoe 27 9 is moved to grip the thread just after the takeup has set thestitch and before the pull'oif acts, and is moved to release the threadafter the pull-off has drawn the thread from the supply and just beforethe rotary hook draws out the loop which it passes over the bobbin caseto its greatest extension. The thread handling parts are so arrangedthat the hook at this time pulls thethread just taut, and so draws-downthe thread which has been taken from the supply by the pull-0H. Y Y

The rear thread lock, indicated generally by 277, consists of a threadroll 290 over which the thread is carried in a complete turn and acooperating clamping shoe 291 which is adapted to grip the threadagainst the rOll. The clamping shoe 291 is formed on the free end of alaterally extending arm 292 integral with the sleeve 224 which ismounted on the rock shaft 225. The rock shaft 225 is oscillated ashereinbeforc described under the operation of the friction device of thethread tension. Durin the operation of the machine the rock sha t 225begins to turn to the right after the pull-ofl' finger begins itsdescent. The rock shaft 225 is turned slowly enough to the right and theclamping shoe 291 has sufiicieiit motion relative to the roll 290, sothat the thread is not gripped by the rear thread lock until after thecompletion of the pulloff stroke. The application of the friction deviceto the thread tension wheel is preferably so timed that the pull-01'1"will draw thread freely through the tension device during the first partof its stroke and will draw thread against the tension of the frictiondevice during the last part of its stroke. Such timing of the frictiondevice is attained by adjusting the'fulcrum pin 221 so that as the rockshaft 225 is turned to the right the lever 220 will not engage againstthe fulcrum pin 22.1 and move the bar 213 to apply the friction deviceto the wheel 212, until the pnll-ofi' is nearing the completion of itsstroke. The above timing of the friction device saves needless work onthe part of the pull-off in drawing the thread from the supply undertension during the first part of its stroke, since it is only during thelast part of the pull-ofi' stroke that the tension is needed to insurethat the thread be taut over the pull-off so that no extra thread willbe stolen from the supply. Moreover, the application of the frictiondevice while the wheel 212 is moving obviates the extra strain whichwould otherwise be put upon the thread in starting the wheel 212 againstthe static friction of the friction disks 215 and 216 which would begreater than is the moving friction of the wheel 212 against saidfriction disks. It is obvious, however, that the pin 221. may be soadjusted that the lever 220 will be in contact therewith when the rockshaft 225 begins its turning movement to the right so as to put thethread under tension during the entire stroke of the pullofi, if'sodesired. 'W'hen the presser foot lifting treadle is depressed to raisethe presser foot, the rock shaft 225 will be turned to the left, ashereinbefore described, and will release the clamping shoe 291 from thethread. The amount ofturning imparted to the rock slgaft225 by thetreadle will be sufiicient to move the lever 220 out of contact with thepin 221 and so release the friction device from the thread tensionwheel. When the machine is turned to free the work from the needle andawl so that it may be easily removed, the front thread lock is open, andthe thread is thus entirely free to be drawn out from the supply as thework is removed from the machine.

The invention having thus been described, what is claimed is 1. A sewingmachine, having in combination, stitch forming devices, a work support,a presser foot, a thread tension device acting to put tension on tlll'thread as the thread is drawn through said device, a thread lock, andmeans under the control of the operator for simultaneously releasing thetension on the thread, opening the thread lock and raising the presserfoot to permit the removal and insertion of the work. 2. A sewingmachine, having in combination, stitch forming devices, a thread tensiondevice acting to put tension on the thread as the thread is drawnthrough said device, a thread lock, and means under the control of theoperator for simultaneously releasing the tension on the thread andopening the thread lock to permit the thread to be freely drawn from thesupply on the removal of the work.

3. A sewing machine, having in combi .1-

tion, a needle, an awl, a take-up, a pull-0E, a tension, a front threadlock between the takeup and pull-off, a rear thread lock between thepull-oif and tension, the parts being so timed that the front threadlock is open, the rear thread lock is closed and the thread is held bythe tension at the time when the needle and awl are out of the work, andmanually operable means for opening the rear thread lock and releasingthe tension so that the thread may be freely drawn from the supply whenthe work is removed from the machine.

' 4. A sewing machine, having in combination, a needle, an awl, a worksupport, a presser foot, a take-up, a pulLofi', a tension, a frontthread lock between the take-up and pull-oil, a rear thread lock betweenthe pull-ofi' and tension, the parts being so timed that the frontthread lock is open, the rear thread lock is closed and the thread isheld by the tension when the needle and awl are out of the work, andmanually operable means for simultaneously lifting the presser foot,opening the rear lock, and releasing the tension so that the work may beeasily removed from the machine.

5. A sewing machine, having in combination, stitch forming devices, athread tension device acting to put tension on the thread as the threadis drawn through said device, a. thread lock, power driven meansconnected to and arranged to apply and release the tension and open andclose the lock, and manually operablemeans connected to said powerdrivenmeans and operating therethrough to independently release thetension and open the lock.

6. A sewing machine, having in combination, stitch forming devices, athread lock, a thread tension device acting to put tension on the threadas the thread is drawn through said device, power driven means includinga cam and connections between the cam and the tension and thread lock toapply a tension to the thread and to lock the thread during each cycleof stitch forming operation, and manually operable means connected toand arraizged to actuate said connections independently of the cam torelease the thread lock and tension.

7. A sewing machine, having in combination, stitch forming devices, athread look, a tension, powerdriven means including a toggle foractuating the thread lock "and tension, and manually operable meansconnected to and adapted to independently actuate the toggle to unlockthe thread lock and release the tension.

8. A sewing machine, having in combination, stitch forming devices, atension including a friction device, a cam for applying and releasingthe friction device, connections between the cam and friction deviceincluding a toggle, and manually operable means connected to andarranged to actuate the toggle independently (f the cam to release thefriction device.

9. A sewing machine, having in combination, stitch forming devices, athread tension including a friction device, a lever connected to andarranged to actuate the friction device, power driven means connected toand arranged to oscillate the lever, a fulcrum for the lever which isadjustable to vary the timing of the movement communicated by the powerdriven means through the lever to the friction device.

10. A sewing machine, having in combination, stitch forming devices, atension ineluding a friction device, a bar, a spring to move the bar inone direction to release the friction, a lever connected to and arrangedto move the bar in the opposite direction to apply the friction, powerdriven means connected to and arranged to oscillate the lever, a,fulcrum for the lever against which the lever is moved during a part ofeach cycle of operations to apply the tension and away from which thelever is moved during the remainder of the cycle to allow the bar to bedrawn by the spring to release the tension.

11. A sewing machine, having in combination, stitch forming devices, athread tension wheel, a friction device for the tension wheel comprisina friction disk adapted to bear against sai wheel, a slidably mountedbar upon which the friction disk is loosely splined, a spring on the baracting to press the disk in a direction to engage the wheel, an abutmenton the bar engaging the disk and limiting its movement under the actionfrom the movable disk to allow the spring -to hold the disk against thewheel and actthe movable disk toward the fixed ing during the remainderof the allow the abutment to engage the disk and release it from thewheel.

12. A sewing machine, having in combination, stitch forming devices, athread tension wheel, a friction device for the wheel comprisingstationary and movable friction disks, a slidably mounted bar upon whichthe movable friction disk is loosel splined, a spring mounted on the barand pressing disk to engage the wheel therebetween, an abutment on thebar limiting the movement of the movable friction disk under theactionof the spring, and power driven means acting on the bar during a part ofeach cycle of operations to withdraw the abutment from the c cle toiZ-iction movable disk to allow the spring to hold the disk against thewheel and acting during the remainder of the cycle to allow the abutmentto engage the movable disk and release it from the wheel.

13. A sewing machine, having in combination, stitch forming devices, athread lock, and power driven means to open and close the lock includinga rock shaft bearing two oppositely extendlng arms, cam rollers upon theends of the arms, and a cam wheel having two cam surfaces formed thereonto cooperate with the cam rollers.

14. A sewin machine, having in combination, stitch orming devices, apull-ofi, a thread tension, a, thread lock constructed to grip thethread between the pull-ofi and tension, and a common power driven meansfor actuating the tension and lock arranged to put a tension upon thethread during the action of the pull-ofl and to grip the thread in thelock at the completion of the thread drawing movement of the pull-oil.

15. A sewing machine, having in combination, stitch orming devices, apull-ofl, a

thread tension between the pull-ofi' and the thread supply including afriction device, and means for actuating the friction device to put atension on the thread during the latter part only of the thread drawingmovement of the pull-ofl'.

LAURENCE E. TOPHAM.

' s'lplined, a spring on the bar acting to press .of operations towithdraw the abutment.

e disk'in a direction to engage the Wheel, an abutment on the barengaging the disk and limiting its movement under the action of thespring, and power driven means acting on the bar during a part of eachcycle from the movable disk to allow the spring -to hold the diskagainst the wheel and acting during the remainder of the cfvcle to allowthe abutment to engage the riction disk and release it from the wheel.

12. A sewingmachine, having in combination, stitch forming devices, athread tencomprising dlsks, a s 1 sion wheel, a frictiondevice for thewheel stationary and movable friction dably mounted bar upon which themovable friction diskis loosely splined,

aspring mounted on the bar and pressing the movable disk toward thefixed disk to engage the wheel thereb'e'tween, an abutment on the barlimiting the movement of the movable disk to allow the spring to holdthe disk against the wheel and acting during Corrections In LettersPatent NoI-I ,1'. 70,024

the remainder of the cycle to allow the abutsetts, for an improvement inSewing-Machines,

ing read extending; same page, line 2 8, for the word mav the saidLetters Patent should be read with these corrections ment to engage themovable disk and re lease it from the wheel.

13. A sewing machine, having in combination, stitch forming devices, athread lock, and power driven means to open and close the lock includinga rock shaft bearing two oppositely extending arms, cam rollers upon theends of the arms, and a cam wheel having t'w'o cam surfaces formedthereon to co-- operate with the cam rollers.

14. A sewin' machine, having in combination, stitch orming devices, apull-off, a thread tension, a thread lock constructed to grip the threadbetween the pull-01f .and tension, and a common power driven means foractuating the tension and lock arranged to put a tension upon the threadduring the action of the pull-ofi' and to grip the thread in the look atthe completion of the vthread drawing movement of the pull-ofl'.

15. A sewin machine, having in combination, stitch orming devices, apull-01f, a thread tension between the pull-ofl and the thread supplyincluding a friction device, and means for actuating the friction deviceto put a tension on the thread during the latter part only of the threaddrawing move-' ment of the AURENCE E. TOPHAM.

, It is hereby certified that in Eetters- Patent [No. 1,170,024, grantedFebruary 1,1916, upon the application of Laurence E. Topham, ofSwampscott, Massachuerrors appear in the printed specification requiringcorrection as follows: Page 4, line 11, for the word ertendread my; andthat therein that the same may conform-to the recordof the case in thePatent Office.

"Signed and sealed this 7th day of March, A. 1)., 1916.

J. r. NEWTON, Acting Commissioner ofPatenta.

It is hereby certified that in Letters Patent (No. 1,170,024, grantedFebruary 1, 1916, upon the application of Laurence E. Topham, ofSwampscott, Massachusetts, for an improvement in Sewing-Machines, errorsappear in the printed specification requiring correction as follows:Page 4, line 11, for the word ertending read extending; same page, line28, for the word mav read may; and that the said Letters Patent shouldbe read with these corrections therein that the same may conform to therecord of the case in the Patent Office.

Signed and sealed this 7th day of March, A. D., 1916.

[snub] J. '1. NEWTON,

Cl. 112-20. Acting Omnmissiomr of Patents.

